This training circular contains basic and advanced training and techniques for static line parachuting. It is designed to standardize procedures for initial qualification and training of personnel in their duties and responsibilities in airborne operations. The jumpmaster, assistant jumpmaster, safeties, DACO, DZSTL, and DZSO occupy key positions in airborne operations. This manual contains the initial training and qualifications of the personnel designated to occupy these critical positions. This training circular (TC) provides all Department of Defense (DOD) Airborne personnel with techniques and training guidelines to maintain an Airborne force. It also updates FM 3.21.220, dated 23 September 2003. This publication supersedes FM 3-21.220/MCWP 3-15.7/AFMAN11-420/NAVSEA, SS400-AF-MMO-010, 23 Sept 2003. This book applies to the U.S. Army, the U.S. Army National Guard (ARNG), the U.S. Army Reserve (USAR), the United States Marine Corps, the Department of the Navy, and the Department of the Air Force. TC 3-21.220 (FM 3-21.220) MCWP 3-315.7 AFMAN 11-420 NAVSEA SS400-AF-MMO-010